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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '0c3a98cdfa38ba72ed22e6b85e8250506c206953d87fe7fe5b95617c315d42f6' 
  AND token = 'D05vtDq2PcrZANYFxIyFnAfDPLWaUuKdWczS5mzi8C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}